Transmission-gearing.



.l. LEDWINKA.

TRANSMISSION GEARING. APPLICATION FILED OCT. 21. 191 1 26mm,-

v Patented June 4, 1918.

J. LEDWINKA.

IRANSMLSSION BEARING.

APPLICATION FILED OCT-2|, I913.

Patented June 4, 1918.

2 SHEETS-SHEET 2.

the construction,

Specification of Letters Patent.

TRANSMISSION- GEARING.

Application filed October 21, 1913. Serial no. 798,378.

To all whom it ma concern:

Be it known t at I, JOSEPH LEDWINKA, a citizen of the United States, residin at Philadelphia, county of Philadelphia, tate of Pennsylvania, have made a certain new and useful Invention in Transmission-Gearing, of which'the following isa specification/ This invention relates to transmission gearing.

The object of the invention vide a gearing, for transmitting varying and reversing rotary motion.

A further object 1s to provide a construc-. tion of gearing which is simple and efiicient for securing speed reduction and direction change in power transmission apparatus.

Other ob ects of the invention will ap-' pear more fully hereinafter.

The invention .consists substantially in combination, location and relative arrangement of parts, all as will be more fully hereinafter set forth as shown in the accompanying drawings, and finally pointed out in the appended claims.

Referring to the accompanying drawings and to the various views and reference signs appearing thereon, Figure 1 is a view in transverse section on the line 2, 2, Fig. 2, looking in the direction of the arrows, and showing a 'construction of gearing embodying the principles of my invention.

Fig. 2 is a view in vertical central longitudinal section of the same.

Fig. 3 is an end view of the same, the driving shaft being in transverse section.

Fig. 4 is a view in side elevation, parts broken out and parts in vertical central longitudinal section, showing a modified construction embodying my invention.

The same part is designated by the same reference numeral wherever it occurs throughout the several views. f

In the drawing 5, designates what I will term the driving-"shaft and 6 the driven shaft. These shafts are suitably journaled in standards 7, 8, of the supporting frame. The driving shaft is designed to be driven at a high speed and in constant direction from any suitable orfconvenient'source of power, and l have shown a belt pulley 9, as an illustrative driving connection to said shaft 5. The driven shaft 6 is to be driven is to prohave, respectively, 49

from shaft 5 at a reduced speed and either in the same or reverse direction with reference to the speed and direction of rotation of the drive shaft 5, the caring presently to be described, accomplis ing the desired variation in speed and direction of rotation of the driven shaft 6, or the arrest of said shaft, as occasion may require, without arresting or varyingthe speed or the direction of rotation of shaft 5. The driven shaft 6, is designed to be utilized for any desired purpose or to drive any desired machine or other gearing or for whatever p lurpoise a power driven shaft may be emo e P lllounted upon to rotate with the shaft 6 is a member 10, having an annular gear 11 with internal teeth. Loosely mounted on the driving shaft are members 12, 13,

respectively carrying the annular gears 14,

15, each having internal teeth. The annular gears 11,14, 15 are all of ,the same Eccentrically mounted internal diameter. upon the drive shaft 5, is a spur gear 16, which may be in one piece of uniform external diameter throughout, and having exterior teeth of sufiicient length to simultaneously mesh with the internal gears 11, 14, 15, as shown in Fig. 2, or which ma be made in separate parts 17,18, 19, 0 an equal external diameter, said parts being bolted or otherwise secured .together, and having external gear teeth respectively meshing with the internal annular gears 11,14, 15, as shown in Fig. 4. I shall refer to this element as the eccentric gear and wish to be understood as including thereby thesingle part construction of Fig. 2 or the separate part construction of Fig. 4. In either case the eccentric ear is loosel sleeved, eccentrically, upon t e drive sha t 5, to rotate thereon. The gear teeth of the eccentric gear and of the annular gears are all formed on the same pitch line, and this is one of the important features of my invention. The relative numbers of gear teeth of the internal gears 11, 14, 15, Figs. 2 and 4 or of the parts 17, 18, 19, of the eccentric gear Fig. in accordance with my invention, arevaried, as desired to secure the desired results. For illustration the annular gear 11, may have, say gear teeth while the annular gears 14, 15, may and 51. In this case,

Patented June 4, T919.

as will appear more fully hereinafter, a fifty to one speed reduction is secured between shafts 5 and 6, in certain conditions of control, while a reduction of forty nine to one but in the reverse direction is secured As above members I wish .to include either case.

With the arrangement above described it' will be seen that when the gears 14:, 15, are both free to revolve the eccentric gear will not have any axial rotation imparted thereto and therefore will exert no rotative action upon the internal gear 11, and consequently the driven shaft 6 will not be rotated. If,-however, either one or the other of the internal gears 14, 15, is locked against rotation, then the eccentric gear will be axially rotated, in which case the gear 11, and with it the shaft 6 will be rotated at the speed reduction and in the direction dependent upon which one of the gears 14, 15, is locked. While I have mentioned fifty, forty nine and fifty-one as the relative numbers of the gear teeth of the gears, I wish it to be understood that these numbers are given merely for illustrating purposes as any other relative numbers of teeth may be employed so long as they all remain on the same pitch line and are of equal internal diameter. The important feature being that the gear 11 on the driven shaft on its driving spur gear member, has a greater number of teeth than one of the remaining annular or spur gear members, and a ,lessnumber than the other of the annular or spur ear members, in order to secure the desire results. i

An desired means ma be provided for.

effect ng the locking of t egears as above descrlbed. I have shown a simple arrangement and also a mounting of the annular gear members, which securescompactness,

and wherein the member 13 is provided with an extended hub 20 loosely sleeved upon shaft 5, while the hub of member 12 is loosely ournaled' upon hub 20. The member 12 is provided with an overhanging cylindrical portion21 which encompasses and incloses the member 13 and its gear 15. The carrier 12 may be locked by applying a suitable brake, indicated at 22, Fig. 4. tothe ex- 7 mounted thereon to rotate therewith, mde- "pendent internal gears loosely journaled and terior cylindrical surface 21 of said member. In order to lock the member 13 and its internal annular gear 15, I; mount a brake wheel 23 upon the hub 20 of said member 13, and key the same thereto, and apply a suit able brake, indicated at 24, to the exterior cylindrical surfaceof said brake wheel.

= Having now set forth the objects and nature of my invention and constructionsemdriven shaft, an internally toothed annular gear member carried thereby and rotating therewith, and loosely journaled internally toothed annular gear members of equal in- .ternal diameter with each other and with said first named internally toothed annular gear member, said externally toothed gear member meshing with all of said internally toothed gear members, said gear members having their gear teeth formed on the same pitch line but varying from each other in the relativenumbers of their teeth, and means for locking one or the other of said loosely journaled gear, members.

2. In a transmission gearing, a drive and a driven shaft, intermediate ear members therebetween includin toothed gears of .equa internal diameters, and an externally toothed eccentrically mounted gear, all of said gears having gear teeth formed on the same pitch line but with relatively varying numbers of teeth, and means for independently locking one of said intermediate annular gear members.

annu ar internally mounted on said drive shaft, said eccentric gear of uniform external diameter and meshing with all of said internal gears, said gears havin teeth formed on the same pitch line but which relatively vary in number.

4. Ina transmission gearing, a drive shaft, a spur gear eccentrically mounted thereon, a driven shaft having an internal gear meshing with the eccentric gear, independent internal gears loosely-mounted on said drive shaft and also meshing with said spur gear, said loosely mounted gears being of equal internal. diameter with and respectively having a larger and a smaller number of gear teeth than the internal gear on the driven shaft and means for locking independently said loosely mounted gears. y

5. In. a transmission .gearing, a drive shaft, a .spur gear eccentrically mounted thereon, a driven shaft, an internal gear eing of equal internaldiameter and respectively having a greater and a, smaller number of teeth than the internal gear on the driven shaft all of said internal gears meshing with the eccentric gear and brake devices for independently locking said loosely mounted gears.

'spectively a greater and a smaller number of teeth than the gear on the driven shaft, and means to independently lock said first men tioned members against rotation;

7. In a transmission gearing, a drive shaft, a spur gear eccentrically mounted thereon, a member having an extended hub loosely sleeved upon said shaft, and carrying an internal annular gear, a member loosely journaled upon said hub and having an overhanging cylindrical portion to encompass the first mentioned member, and carrying an internal gear, a brake wheelkeyed upon said hub, a driven shaft having an internal gear,

with said eccentric gear, said first mentioned gears having respectively a greater and a smaller number of gear teeth than the gear on the driven shaft, and means to independently restrain said brake Wheel and overhanging carrier against rotation.

In testimony whereof I have hereunto set my hand in the presence of the subscribing witnesses, on this 8thday of October, A. D.

JOSEPH LEDWINKA. Witnesses S. E. DARBY, G. A. MCGRATH.

all of said internal gears being 25 of equal internal diameters and meshing 

